In order to effectively solve the dead-zone and low-precision of T-shaped transmission line fault location,a new T-shaped transmission line fault location algorithm based on phase-angle jump checking is proposed in th...In order to effectively solve the dead-zone and low-precision of T-shaped transmission line fault location,a new T-shaped transmission line fault location algorithm based on phase-angle jump checking is proposed in this paper.Firstly,the 3-terminal synchronous fundamental positive sequence voltage and current phasors are extracted and substituted into the fault branch distance function to realize the selection of fault branch when the fault occurs;Secondly,use the condition of the fundamental positive sequence voltage phasor at the fault point is equal to calculate all roots(including real root and virtual roots);Finally,the phase-angle jump check function is used for checking calculation,and then the only real root can be determined as the actual fault distance,thereby achieving the purpose of high-precision fault location.MATLAB simulation results show that the proposed new algorithm is feasible and effective with high fault location accuracy and good versatility.展开更多
Objective:To establish the initial symptoms and physical signs of osteosarcoma from the records of the first medical visit and to identify early characteristics of the diseases to shorten the delay of diagnosis. Metho...Objective:To establish the initial symptoms and physical signs of osteosarcoma from the records of the first medical visit and to identify early characteristics of the diseases to shorten the delay of diagnosis. Methods: A group of patients with osteosarcoma in extremities was identified from Nanjing Jinling Hospital. Records from the first medical visit due to symptoms and physical signs related to the bone tumor were obtained from 71 patients with osteosarcoma. Results: The results of the data recorded about the first medical visit,reasons for consultation, pain,trauma,initial diagnosis,delay in diagnosis were reported respectively. Conclusion: Pair an initial symptom of osteosarcoma,and was intermittent but not frequently felt at night.A history of trauma was common,but the clinical course often diverged from what was expected from trauma.The most important clinical feature was a palpable mass. This finding emphasizes that a thorough physical examination is absolutely necessary.展开更多
基金supported by National Nature Science Foundation of China(51507031).
文摘In order to effectively solve the dead-zone and low-precision of T-shaped transmission line fault location,a new T-shaped transmission line fault location algorithm based on phase-angle jump checking is proposed in this paper.Firstly,the 3-terminal synchronous fundamental positive sequence voltage and current phasors are extracted and substituted into the fault branch distance function to realize the selection of fault branch when the fault occurs;Secondly,use the condition of the fundamental positive sequence voltage phasor at the fault point is equal to calculate all roots(including real root and virtual roots);Finally,the phase-angle jump check function is used for checking calculation,and then the only real root can be determined as the actual fault distance,thereby achieving the purpose of high-precision fault location.MATLAB simulation results show that the proposed new algorithm is feasible and effective with high fault location accuracy and good versatility.
文摘Objective:To establish the initial symptoms and physical signs of osteosarcoma from the records of the first medical visit and to identify early characteristics of the diseases to shorten the delay of diagnosis. Methods: A group of patients with osteosarcoma in extremities was identified from Nanjing Jinling Hospital. Records from the first medical visit due to symptoms and physical signs related to the bone tumor were obtained from 71 patients with osteosarcoma. Results: The results of the data recorded about the first medical visit,reasons for consultation, pain,trauma,initial diagnosis,delay in diagnosis were reported respectively. Conclusion: Pair an initial symptom of osteosarcoma,and was intermittent but not frequently felt at night.A history of trauma was common,but the clinical course often diverged from what was expected from trauma.The most important clinical feature was a palpable mass. This finding emphasizes that a thorough physical examination is absolutely necessary.
